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In Reply to: Re: Speaking of Absloute Phase... posted by mothra on August 6, 2005 at 10:56:03:
Summing the channels to mono does not create phase shift. If you care to measure phase using a mono test record you will see that inter-channel phase shift is caused by certain phono cartridges and begins in the higher frequencies, not the lower frequencies. Many phono cartridges exhibit negligible inter-channel phase shift across the entire audio spectrum.
Follow Ups:
i'm not being clear. Different cutting engineers with sum different frequencies into mono, including higher ones (especially int he 70's) and sometrimes this can create problems. I'll dig yup some aes papers on phase anomalies between channels in vinyl. I meant to be brief, not misleading.
The point I was making is that from a playback standpoint, there are no low frequency phase anomalies that I have ever measured using test records. If the recording people don’t know how to record phase properly, I guess that’s their problem, but I can’t see how inter-channel phase anomalies can be encoded into a mono groove. That is one thing I would really like to read about.
well, basically one problem is that information is being made mono that was stereo soi the record can be cut louder. another is cross-talk between channels. more the come.
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